US9411126B2 - Lens barrel having retractable lens, and image pickup apparatus - Google Patents

Lens barrel having retractable lens, and image pickup apparatus Download PDF

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Publication number
US9411126B2
US9411126B2 US14/254,781 US201414254781A US9411126B2 US 9411126 B2 US9411126 B2 US 9411126B2 US 201414254781 A US201414254781 A US 201414254781A US 9411126 B2 US9411126 B2 US 9411126B2
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Prior art keywords
holding member
optical axis
lens
guide bar
drive mechanism
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Expired - Fee Related
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US14/254,781
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US20140313602A1 (en
Inventor
Tomoyuki Kudoh
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Canon Inc
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Canon Inc
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Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUDOH, TOMOYUKI
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer

Definitions

  • the present invention relates to an image pickup apparatus such as a digital still camera or a digital video camera, and a lens barrel which the image pickup apparatus has.
  • Digital cameras which are capable of taking an image of a subject using an image pickup device such as a CCD or a CMOS and capturing the taken image into memory have been in widespread use. Such digital cameras perform an optical zooming operation in which the shooting angle of view is varied by changing the spacing between a plurality of taking lens groups.
  • image pickup device such as a CCD or a CMOS
  • Such digital cameras perform an optical zooming operation in which the shooting angle of view is varied by changing the spacing between a plurality of taking lens groups.
  • there has been an increasing demand for higher optical zoom rate and thinner camera bodies and realization of an arrangement that enables increase in the stroke of a taking lens group and miniaturization of a camera main body has been required.
  • a lens group inside the taking lens barrel is laterally retracted from the center of an optical axis so that the taking lens barrel as a whole can be slimmed down.
  • a group-3 lens which is one of within-group lenses is retracted in the taking lens barrel in a direction perpendicular to the optical axis so that the taking lens barrel as a whole can be slimmed down (see Japanese Laid-Open Patent Publication (Kokai) No. 2008-46504).
  • Japanese Laid-Open Patent Publication (Kokai) No. 2008-46504 is effective for an arrangement having a number of lens groups, but when there is only a small number of lens groups, for example, three lens groups, it is difficult to secure a space for the lens groups to retract. Also, the technique described in Japanese Laid-Open Patent Publication (Kokai) No. 2012-58354 has a problem that a structure for retracting the lens holder is complicated. When the lens groups held by the lens holder lies on an optical axis, the lens holder is in a one-side abutting state, and image quality may be unstable due to irregularities in operation.
  • the present invention provides a lens barrel which is capable of retracting a retractable lens group by a simple construction and realizing stable image quality.
  • a first aspect of the present invention provides a lens barrel comprising a lens, a first lens holding member configured to hold the lens, a second lens holding member configured to hold the first lens holding member and be movable in a direction of an optical axis in conjunction with the first lens holding member, a drive mechanism configured to move the first lens holding member between a shooting position on the optical axis and a retracted position outside the optical axis, and a first guide bar and a second guide bar configured to support the second lens holding member, wherein the drive mechanism retracts the first lens holding member from the shooting position to the retracted position while holding the second lens holding member on the optical axis, and the first guide bar and the second guide bar guide the second lens holding member in the direction of the optical axis.
  • a second aspect of the present invention provides an image pickup apparatus comprising a lens barrel comprising, a lens, a first lens holding member that holds the lens, a second lens holding member that holds the first lens holding member and is movable in a direction of an optical axis in conjunction with the first lens holding member, a drive mechanism that moves the first lens holding member between a shooting position on the optical axis and a retracted position outside the optical axis, and a first guide bar and a second guide bar that support the second lens holding member, wherein the drive mechanism retracts the first lens holding member from the shooting position to the retracted position while holding the second lens holding member on the optical axis, and the first guide bar and the second guide bar guide the second lens holding member in the direction of the optical axis.
  • the first lens holding member which holds the lens is able to move in the direction of the optical axis in conjunction with the second lens holding member supported by the first guide bar and the second guide bar.
  • the drive mechanism moves the first lens holding member between the shooting position and the retracted position.
  • the lens can be moved and retracted in the direction of the optical axis by a simple construction.
  • the second lens holding member is supported in a stable condition, the lens can also be held in a stable condition, and as a result, image quality can be stable.
  • FIGS. 1A and 1B are a perspective view and a rear view, respectively, showing an appearance of a digital camera which is an exemplary image pickup apparatus having a taking lens barrel according to an embodiment of the present invention.
  • FIG. 2 is a block diagram schematically showing an arrangement or the digital camera in FIGS. 1A and 1B .
  • FIG. 3 is a cross-sectional view showing the taking lens barrel, which the digital camera in FIGS. 1A and 1B has, in a retracted state.
  • FIG. 4 is a cross-sectional view showing the taking lens barrel in FIG. 3 in an extended state.
  • FIG. 5 is a perspective view showing a placement of a retractable lens group when the taking lens barrel in FIG. 3 lies in the retracted state.
  • FIG. 6 is a perspective view showing a placement of the retractable lens group when the taking lens barrel in FIG. 3 lies in a shooting state.
  • FIG. 7 is a view showing a state of the retractable lens group when the taking lens barrel in FIG. 3 shifts from the shooting state into the retracted state.
  • FIG. 8 is a view showing paths taken by respective lens group holding members included in the taking lens barrel in FIG. 3 .
  • FIG. 9 is a view showing how a to-be-retracted lever moves when a retractable lens group holding member included in the taking lens barrel in FIG. 3 is retracting.
  • FIG. 1A is a perspective view showing an appearance of a digital camera which is an exemplary image pickup apparatus having a taking lens barrel according to the present embodiment.
  • FIG. 1B is a rear view showing the digital camera in FIG. 1A .
  • the digital camera 100 in FIGS. 1A and 1B is equipped with a taking lens barrel 150 having a zooming mechanism capable of varying shooting magnification. It should be noted that an arrangement of the taking lens barrel 150 will be described later in detail.
  • a shutter release button 101 , a zoom rate selection switch 102 , and a power selection button 103 are provided on an upper surface of a main body of the digital camera 100 .
  • An auxiliary light, irradiation opening 104 which provides auxiliary light when photometric measurement and distance measurement are performed, a viewfinder 105 , and an electronic flash. 106 are disposed in an upper portion of a front surface of the main body of the digital camera 100 .
  • Operation buttons 109 , 110 , 111 , 112 , 113 , and 114 are disposed on a rear surface of the main body of the digital camera 100 .
  • a finder eyepiece 107 for visually identifying a subject, and a display 108 comprised of a liquid crystal panel are disposed on the rear surface of the main body of the digital camera 100 .
  • a subject being shot, an image stored in a memory 214 (see FIG. 2 ), an image read from a memory card drive 216 (see FIG. 2 ), menu screens associated with operation of the operation buttons 109 to 114 , and so on can be displayed on the display 108 .
  • FIG. 2 is a block diagram schematically showing an arrangement of the digital camera 100 . It should be noted that among component elements of the digital camera 100 in FIG. 2 , those which are identical with the component elements shown in FIGS. 1A and 1B are designated by the same reference numerals, and description thereof is omitted.
  • the digital camera 100 has a drive circuit 201 , and a CPU 203 which constitutes a control unit, a ROM 204 , and a RAM 205 , and they are connected to each other via a bus 202 such that they can communicate with each other.
  • the CPU 203 is responsible for controlling the overall operation of the digital camera 100 .
  • Programs, which are required to perform various functions of the digital camera 100 , and others are stored in the ROM 204
  • data, which is required for various control programs, and others are stored in the RAM 205 .
  • the CPU 203 expands programs, which are stored in the ROM 204 , into the RAM 205 and executes them to control various drive elements constituting the digital camera 100 .
  • the shutter release button 101 , the zoom rate selection switch 102 , the power selection button 103 , the display 108 , the operation buttons 109 to 114 , the memory 214 , a compression-decompression unit 215 , and the memory card drive 216 are connected to the bus 202 .
  • a focus drive mechanism 251 , a zooming mechanism. 252 , a shutter drive mechanism 206 , a diaphragm drive mechanism 208 , an image pickup device 210 such as a CCD or a CMOS, and the electronic flash 106 are connected to the drive circuit 201 .
  • the drive circuit 201 operates various drive mechanisms and others connected to the drive circuit 201 .
  • the focus drive mechanism 251 drive a focus lens 250 .
  • the zooming mechanism 252 controls zooming of the taking lens barrel 150 .
  • the shutter drive mechanism 206 drives a shutter 207 .
  • the diaphragm drive mechanism 208 drives a diaphragm 209 .
  • An analog electric signal output from the image pickup device 210 is input to an analog signal processing unit 211 , which in turn subjects the obtained analog electric signal to predetermined processing and outputs the resulting analog electric signal to an A/D conversion unit 212 .
  • the A/D conversion unit 212 converts the obtained, analog electric signal into a digital signal and outputs the generated digital signal to a digital signal processing unit 213 .
  • the digital signal processing unit 213 subjects the digital signal to predetermined processing and stores the digital signal in the memory 214 .
  • Image data stored in the memory 214 and image data stored in the memory card drive 216 are subjected to an expansion process by the compression-decompression unit 215 , and the decompressed image data is displayed on the display 108 via the bus 202 .
  • FIG. 3 is a cross-sectional view showing the taking lens barrel 150 in a retracted state (collapsed state).
  • FIG. 4 is a cross-sectional view showing the taking lens barrel 150 in a shooting state (used state (extended state)).
  • the taking lens barrel 150 shifts from the shooting state into the retracted state by a collapsing action and shifts from the retracted state into the shooting state by an extending action.
  • the taking lens barrel 150 has a retractable lens group 301 , a first lens group 314 , and a second lens group 316 .
  • the first lens group 314 is held by a first lens group holding member 315 .
  • the second lens group 316 which is disposed behind the first lens group 314 (on the image pickup device 210 side (image plane side)) and held by a second lens group holding member 317 .
  • the retractable lens group 301 which is the focus lens 250 shown in FIG. 2 , is held by a retractable lens group holding member 302 and disposed behind the second lens group 316 .
  • a moving cam ring 319 is disposed on an outer periphery of the first lens group holding member 315
  • a straight advance cylinder 318 is disposed on an inner periphery of the first lens group holding member 315 .
  • the moving cam ring 319 and the straight advance cylinder 318 which are bayonet-coupled to each other, are rotatable with respect to each other and integrally move in a direction of an optical axis.
  • a fixed cam ring 320 is disposed on an outer periphery of the moving cam ring 319
  • a drive ring 321 is disposed on an outer periphery of the fixed cam ring 320
  • a holding cylinder 322 is disposed on an outer periphery of the drive ring 321 .
  • the drive ring 321 is caused to rotate by power transmitted from the zooming mechanism 252 , and rotative force of the drive ring 321 rotates the moving cam ring 319 .
  • a cam groove is provided on an inner periphery of the fixed cam ring 320 , and the moving cam ring 319 follows this cam groove to move in the direction of the optical axis while rotating.
  • the straight advance cylinder 318 moves integrally with the moving cam ring 319 in the direction of the optical axis, but the straight advance cylinder 318 is inhibited from rotating and caused to advance straight by the fixed cam ring 320 .
  • a plurality of cam grooves is provided on an inner periphery of the moving cam ring 319 , enabling the first lens group holding member 315 and the second lens group holding member 317 to follow the cam grooves with different cam paths.
  • the first lens group holding member 315 and the second lens group holding member 317 are caused to advance straight by the straight advance cylinder 318 , and hence they move in the direction of the optical axis without rotating.
  • the image pickup device 210 is disposed on the rearmost surface of the taking lens barrel 150 and held by an image pickup device holding member 313 .
  • FIGS. 5 to 7 a moving group 303 , a moving base 304 , a lead screw 311 , a stepping motor 310 , a nut 312 , and a retractable group lifting preventive spring 323 in FIGS. 3 and 4 will now be described with reference to FIGS. 5 to 7 .
  • FIGS. 5 to 7 are perspective views showing a retracting structure of the retractable lens group 301 .
  • FIG. 5 is a perspective view showing a placement of the retractable lens group 301 when the taking lens barrel 150 lies in the retracted state.
  • FIG. 6 is a perspective view showing a placement of the retractable lens group 301 when the taking lens barrel 150 lies in the shooting state.
  • FIG. 7 shows a state of the retractable lens group 301 when the taking lens barrel 150 shifts from the shooting state into the retracted state.
  • a shaft member 507 which is shaped like a shaft, is mounted on the moving base 304 .
  • the retractable lens group holding member 302 is pivotally supported on the shaft member so as to be rotatable with respect to the shaft member 507 .
  • a projecting portion 302 a provided in the retractable lens group holding member 302 is stopped in a state of being with a cutaway portion 304 a formed in the base member 304 , and the retractable lens group holding member 302 is urged by a torsion spring 508 so that the retractable lens group holding member 302 can be held at the center of the optical axis with respect to the moving base 304 .
  • a plurality of cam grooves is provided on an inner periphery of the drive ring 321 , and a plurality of followers 509 provided in the moving group 303 follow the respective cam grooves so that the moving group 303 can move in the direction of the optical axis, and on this occasion, the moving group 303 is caused to advance straight by the fixed cam ring 320 .
  • the moving group 303 is equipped with a stepping motor 310 which is an actuator (see FIGS. 3 and 4 ).
  • a guide bar 505 and a sub guide bar 506 are fixed to the moving group 303 .
  • the lead screw 311 is mounted on the stepping motor 310 , and the nut. 312 is engaged with the lead screw 311 .
  • the nut 312 is fixed to the moving base 304 .
  • the moving base 304 moves in the direction of the optical axis integrally with the moving group 303 .
  • the moving base 304 moves in the direction of the optical axis in a state of being supported by the guide bar 505 and the sub guide bar 506 as the position of the nut 312 with respect to the lead screw 311 shifts.
  • the moving base 304 can move in a stable condition in the direction of the optical axis while being supported by the guide bar 505 and the sub guide bar 506 , the retractable lens group 301 held by the retractable lens group holding member 302 mounted on the moving base 304 can be held in a stable condition, and as a result, stable image quality can be realized.
  • the digital camera 100 performs a focusing operation by running the stepping motor 310 according to a position at which an image of a subject is formed. Accordingly, the stepping motor 310 only has to be able to move the moving base 304 .
  • the image pickup device holding member 313 disposed on the rear side of the retractable lens group holding member 302 is provided with a retracting lever 513 a projecting toward the retractable lens group holding member 302 .
  • the retractable lens group holding member 302 is provided with a to-be-retracted lever 502 a Referring to FIG. 7 , with a retracting operation in which the taking lens barrel 150 is shifted from the shooting state into the retracted state, the retracting lever 513 a gives rotative force to the to-be-retracted lever 502 a . This rotates the retractable lens group holding member 302 as shown in FIG.
  • the retractable lens group 301 held by the retractable lens group holding member 302 moves from the shooting position on the optical axis to the retracted position away from the optical axis.
  • movement of the retractable lens group holding member 302 between the shooting position and the retracted position is realized by a simple arrangement.
  • the taking lens barrel 150 can be downsized, and by extension the digital camera 100 as a whole can be miniaturized.
  • the retractable lens group holding member 302 moves to the retracted position, a force acts such that the retracting lever 513 a pushes up the retractable lens group holding member 302 from the image pickup device holding member 313 side, and hence the retractable lens group holding member 302 causes the moving base 304 to lift toward a subject.
  • the lifting of the moving base 304 is conspicuous in a part supported by the sub guide bar 506 . Accordingly, when the taking lens barrel 150 is to be retracted, the retractable group lifting preventive spring (see FIG. 3 ) provided in the second lens group holding member 317 located in front of the retractable lens group holding member 302 urges the moving base 304 rearward so as to prevent the moving base 304 from lifting.
  • FIG. 8 is a view showing paths taken by the respective lens group holding members included in the taking lens barrel 150 .
  • the taking lens barrel 150 is to be retracted (collapsed)
  • the moving base 304 and the second lens group holding member 317 move in the direction of the optical axis while taking substantially the same path in the state of being close to each other.
  • the space between the moving base 304 and the second lens group holding member 317 can be kept constant, which prevents the moving base 304 from lifting.
  • the stepping motor 310 is run to move the moving base 304 closer to the moving group 303 .
  • the taking lens barrel 150 is shifted from the shooting state in FIG. 6 into the retracting state in FIG. 7 .
  • the retracting lever 513 a has not yet come into abutment with the to-be-retracted lever 502 a .
  • the retracting lever 513 a gives rotative force to the to-be-retracted lever 502 a in response to the above movement, and as a result, the retractable lens group holding member 302 moves from the shooting position to the retracted position. Further, the stepping motor 310 is driven to bring the moving base 304 into abutment with the moving group 303 . This brings the entire taking lens barrel 150 into the retracted state in FIG. 5 .
  • FIG. 9 is a view showing how the to-be-retracted lever 502 a moves when the retractable lens group holding member 302 is retracting.
  • the to-be-retracted lever 502 a comes into contact with a tapered portion 513 b of the retracting lever 513 a and slides along the tapered portion 513 b , causing the retractable lens group holding member 302 to rotate in a retracting direction.
  • the to-be-retracted lever 502 a finishes abutting on the tapered portion 513 b and moves in a retracting direction on a side wall portion 513 c.
  • the retractable lens group holding member 302 holding the retractable lens group 301 is pivotally supported on the shaft member 507 provided in the moving base 304 and held on the moving base 304 so as to be retractable. Moreover, because the moving base 304 is supported by the guide bar 505 and the sub guide bar 506 , the retractable lens group 301 can be held in a stable condition during shooting, and stable image quality can be realized.
  • the retractable lens group holding member 302 can be retracted with good timing while the moving base 304 is prevented from lifting. Further, because the retraction space for the retractable lens group holding member 302 is provided inside the constituent members of the taking lens barrel 150 , the taking lens barrel 150 can be miniaturized, and by extension the digital camera 100 as a whole can be miniaturized.
  • the stepping motor 310 is used as an actuator that drives the moving base 304 , this is not limitative, but a voice coil motor may be used.
  • Embodiments of the present invention can also be realized by a computer of a system or apparatus that reads out and executes computer executable instructions recorded on a storage medium (e.g., non-transitory computer-readable storage medium) to perform the functions of one or more of the above-described embodiment(s) of the present invention, and by a method performed by the computer of the system or apparatus by, for example, reading out and executing the computer executable instructions from the storage medium to perform the functions of one or more of the above-described embodiment(s).
  • the computer may comprise one or more of a central processing unit (CPU), micro processing unit (MPU), or other circuitry, and may include a network of separate computers or separate computer processors.
  • the computer executable instructions may be provided to the computer, for example, from a network or the storage medium.
  • the storage medium may include, for example, one or more of a hard disk, a random-access memory (RAM), a read only memory (ROM), a storage of distributed computing systems, an optical disk (such as a compact disc (CD), digital versatile disc (DVD), or Blu-ray Disc (BD)TM), a flash memory device, a memory card, and the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structure And Mechanism Of Cameras (AREA)
  • Lens Barrels (AREA)
  • Studio Devices (AREA)
US14/254,781 2013-04-17 2014-04-16 Lens barrel having retractable lens, and image pickup apparatus Expired - Fee Related US9411126B2 (en)

Applications Claiming Priority (2)

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JP2013-086664 2013-04-17
JP2013086664A JP6195347B2 (ja) 2013-04-17 2013-04-17 撮影レンズ鏡筒及び撮像装置

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US9411126B2 true US9411126B2 (en) 2016-08-09

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JP2017126013A (ja) * 2016-01-15 2017-07-20 キヤノン株式会社 レンズ鏡筒及び撮像装置
US11523034B2 (en) * 2016-02-10 2022-12-06 Microsoft Technology Licensing, Llc Imaging apparatus
JP6746408B2 (ja) * 2016-07-08 2020-08-26 キヤノン株式会社 レンズ鏡筒及びその制御方法、撮像装置
US10317779B2 (en) 2016-08-16 2019-06-11 Microsoft Technology Licensing, Llc Imaging apparatus

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CN104111512B (zh) 2016-12-07
JP2014211482A (ja) 2014-11-13
JP6195347B2 (ja) 2017-09-13
CN104111512A (zh) 2014-10-22
US20140313602A1 (en) 2014-10-23

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